In this problem, we need to know Coulomb's law, which is expressed as:

$\overline{){\mathbf{F}}{\mathbf{=}}\frac{\mathbf{k}{\mathbf{q}}_{\mathbf{1}}{\mathbf{q}}_{\mathbf{2}}}{{\mathbf{r}}^{\mathbf{2}}}}$, where **k** is Coulomb's constant and **r** is the distance between the two charges, **q _{1} **and

We're given,

r_{1} = 0.06 m, F_{1} = 20N, and r_{2} = 0.12 m

From Coulomb's law,

${\mathit{F}}_{\mathbf{1}}\mathbf{=}\frac{\mathbf{k}{\mathbf{q}}_{\mathbf{1}}{\mathbf{q}}_{\mathbf{2}}}{{{\mathbf{r}}_{\mathbf{1}}}^{\mathbf{2}}}\phantom{\rule{0ex}{0ex}}{\mathit{F}}_{\mathbf{2}}\mathbf{=}\frac{\mathbf{k}{\mathbf{q}}_{\mathbf{1}}{\mathbf{q}}_{\mathbf{2}}}{{{\mathbf{r}}_{\mathbf{2}}}^{\mathbf{2}}}$

Two point charges are separated by 6 cm (6 cm = 0.06 m). The attractive force between them is 20 N (20 Newtons). Find the force between them when they are separated by 12 cm (12 cm = 0.12 m). (Why can you solve this problem without knowing the magnitudes of the charges?) What do you know about the sign of the charges (positive, negative, etc)?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Coulomb's Law (Electric Force) concept. You can view video lessons to learn Coulomb's Law (Electric Force). Or if you need more Coulomb's Law (Electric Force) practice, you can also practice Coulomb's Law (Electric Force) practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Ford's class at TAMU.